Heavyweight star Wilder took to Twitter to call out Joshua in a video as he targets a title fight against him.

Wilder has fought 38 professional fights and is unbeaten with 37 knock outs.

Alabama born 31-year-old's next fight is against Bermane Stiverne in New York next month but is eyeing up a fight with Joshua - who tackles Kubrat Pulev to hold onto his IBF, IBO and WBA belts in Cardiff on October 28.

Joshua is one of the biggest targets in the heavyweight division after his stunning title victory over Wladimir Klitschko earlier this year.